Apparently every system so far seems to work at 0.05, I'd say hardcode it to that value. This would be even faster than the current minimum sound lag we have (0.1s), so there should be no complaints. I'm glad to see that you have finally found a solution
Just for reference, I'm on XP with an Audigy 2 ZS and have no problems even at 0.01s.
Just for reference, I'm on XP with an Audigy 2 ZS and have no problems even at 0.01s.